Performance Study of Buffer Control Schemes and Cell Discard Mechanisms in a Shared Buffer ATM Switch

概要

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This paper deals with overload control during congestion in a shared buffer ATM switch via selective cell discard and buffer management.Specifically, we consider the question of efficiency in buffer control schemes in order to reduce the number of cells that have to be discarded during congesiton, in the meantime provide "fair" access to the shared buffer by all users.To prevent performance degradation of the shared buffer switch under imbalance traffic conditions, a "gated" buffer control scheme is proposed.The concept of the "gated" control policy is that we add a control gate in front of the corresponding logical queue of each overloaded output port.Some incoming cells destined for the overloaded ports can be blocked before entering the shared buffer.It will make rooms in the shared buffer for those incoming cells destined for the non-overloaded ports.This gated buffer control scheme can be madeled as a variation of SMXQ (sharing with a maximum queue length) scheme with a set of dynamically adjusted queue length thresholds.The simulation study of the gated buffer control is applied to a shared buffer ATM switch under various cell discard mechanisms.In most cases the proposed gated buffer control scheme can not only reduce the overall cell loss but also satisfy the "fair" access requirement under network congestion conditions, if we adjust the dynamical queue length thresholds properly.
社団法人電子情報通信学会の論文
1998-05-25